var win= null;
function NewWindow(mypage,myname,w,h,scroll,toolbar,location,menubar,status,resizeable)
{ 
var winl = (screen.width-w)/2; 
var wint = (screen.height-h-50)/2; 
var settings ='height='+h+','; settings +='width='+w+','; settings +='top='+wint+','; settings +='left='+winl+','; settings +='scrollbars='+scroll+','; settings +='toolbar='+toolbar+','; settings +='location='+location+','; settings +='menubar='+menubar+','; settings +='status='+status+','; settings +='resizable='+resizeable+',';  
win=window.open(mypage,myname,settings); 
if(parseInt(navigator.appVersion) >= 4){win.window.focus();}
}